Root locus techniques in the log s plane for design and analysis of feedback control systems.
Abstract
Root locus plots in the s plane are practically limited to a span of
two decades. In problems where some poles are very close to the origin,
while other poles or zeros are at very large values of s, sufficient
resolution of the locus may not be available in two decades of the s plane.
However, root loci can be plotted in the In s plane using as many decades
as desired (and whichever are desired).
Electro-Scientific Industries Corporation manufactures an analog computer,
THE ESIAC, which constructs root locus plots in the In s plane.
This paper presents a mathematical analysis of the In s plane, a simple
method of plotting root loci in the In s plane, and several practical
examples demonstrating the technique. Construction of root loci by this
method requires the use of one template.
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